It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever commits a sin and then firmly knows with certainty that Allah, the Mighty and Majestic, if He wills, may punish him, and if He wills, may forgive him, then it becomes a right upon Allah Almighty (out of His generosity) to forgive him."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Abu Tuwalah (may Allah have mercy on him) except Abdullah (may Allah have mercy on him), and no one from Abdullah (may Allah have mercy on him) except Jabir (may Allah have mercy on him), while Qutaybah (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1676
Hadith Gradingمحدثین:إسناده ضعيف لضعف جابر بن مرزوق الجدي
Hadith Takhrij«قال الهيثمي: فيه جابر بن مرزوق الجدي وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 10، ص 211»» «أخرجه الحاكم فى «المستدرك» برقم: 7704»